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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e2b83a1bf695fc13e44e14862e1b97014ecdcb9e9a0e2a9603f2f0e7fb4607d' 
  AND token = 'RsVpY3MhKDhdowSHXT5ssxLhfdY/RAFQtg4kBScQIy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}